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How to Add Change and Reprogram a Mazda 3 Spare Key Its a good idea always to keep an extra key on hand in case you lose the keyfob or it stopped working This article will provide everything you should know about adding changing or reprogramming your Mazda 3 key fobs Certain keys require programming by an expert locksmith while others do not Only use official Mazda replacements to replace your key fob How to add a spare key If youre not fortunate enough to find a spare key from the dealer when you purchase your Mazda 3 or accidentally break the one you have but dont worry theres an option to make another key To accomplish this youll need a small flathead screwdriver and an updated CR2025 battery Once mazda replacement key got the tools it is time to open the key fob First find the button that allows you to release the key Its located underneath the metal portion and is easy to find The cover that covers the back should come off the moment you press the button Then place the screwdrivers tip into the notch at the top or into the space and remove the metal part After the auxiliary key has been removed insert your new or spare key into the slot Set the ignition ON and wait for five seconds then set it to off This will allow the system to recognize the new key and begin your vehicle in the future You can only program three keys on your Mazda 3 The last thing you want is to have more than two working key fobs and not be in a position to get your car started This is a safeguard to prevent unauthorized users from activating your key fobs and starting your vehicle How do I reprogram an unrepaired key If you have a spare key its important to be aware of how to program it in the event your original key gets lost or stolen This will stop unauthorised people from stealing your car and starting it This process should work on any Mazda however youll require two working keys to start the reprogramming process If you dont have two functioning keys youll need to take your vehicle to the dealership to complete the process Start by getting into the drivers seat closing all the doors except the one that is open Place the first working key into the slot then set the ignition to the ON position Wait for five seconds then remove the key and repeat the process with a second key After youve programmed your new key you should have 3 keys that be able to start your car in the future Check each key to make sure that theyre functioning properly before placing them away Its a good idea purchase an extra Mazda 3 key fob particularly if youre a driver who has a tendency to lose their keys or has other issues with it You can purchase one online or at your local auto store Be sure to review the reviews before buying so that you dont get a key fob which isnt compatible with your vehicle How do I change the battery on a spare key Its very frustrating to discover that your key fob has failed and you are not able to unlock your car Its easy to replace the battery yourself and save money at the dealer The first step is to press the auxiliary key button located on the back of the key fob This will detach the metal key and reveal two slots on the opposite side of the case Press the flathead into one of these slots and then gently push the two halves of the case apart When the battery is completely exposed take it out and set aside the case somewhere you wont forget it Make sure you have a replacement battery before you begin You can purchase them at any store that stocks batteries or at a Mazda dealer near Winter Garden Choosing the right battery will ensure that your key fob is working correctly Next put the new battery into place and replace the cap of the battery Be careful not to damage the rubber ring on which the battery rests Press the two halves together until you can hear the click How to Reset a Keyless Entry System The key fob in your Mazda 3 is not only an option for convenience its an important security feature The car wont start if the key is lost or stolen even if you have a spare key fob This is because the fob that you have to be reset at the dealership to work properly This can be a painful and costly experience Therefore its recommended to learn how you can reset the system Remove the battery from the system for 15 minutes This will remove any residual electricity from the onboard computer Then disconnect the LF ECU and demand switch connectors After that test for continuity between the following terminals To program an entirely new key or spare insert it into the slot and turn the ignition to ON Turn off the ignition after approximately five minutes The keys information will be transferred to your vehicles computer and the new fob will be able to start your car in the future You can program up to three fobs but you should only use one at each time This prevents unauthorized people from copying the key and gaining access to your vehicle You can purchase a brand new key fob online however youll still need to visit a dealer or locksmith to cut it and programmed
